Which is the electron configuration for bromine?

Bromine has atomic number 35, so a neutral bromine atom has 35 electrons. Filling the orbitals in order gives 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵, which contains 35 electrons. This is choice A.

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